Instrument for testing the burst strength of sheet material



FIG. 1 is a top, front, and right side perspective view of an instrument for testing the burst strength of sheet material showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a front elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a right side elevational view; and

FIG. 6 is a rear elevational view thereof. 

The ornamental design of an instrument for testing the burst strength of sheet material, as shown and described. 